Quantitative Aptitude - Arithmetic Ability Questions

John is 15 years younger than Jill, 12 years ago, Jill's age was 1.5 times that of John. Jill is now ___ years old.

The speed of car B is half the speed of car A. If car A covers a distance of 120 km in 1.5 hours, what is the speed of car B?

Which of the following is the largest number among 2, 33, 4, 53

If x2 + ax + b, when divided by x + 3, leaves a remainder of -1 and x2 + bx + a, when divided by x - 3, leaves a remainder of 39, then a+ b = ?

A sum of money (P) doubles in 10 years. How much would it be in 20 years at the same rate of simple interest?

A and B can complete a task in 20 days, B and C can complete it in 30 days while C and A can do the same task together in 24 days. How many days will each of and C take to complete the task individually? 

In the following question, select the odd word pair from the given alternatives.

If x - y = -8 and xy = 45, then (x2 + y2) is